Start by looking at your rim near the valve. You care about the first to holes to the right. Assume you're looking from your right and determine if the zigzag from the valve is far then near (left then right), or the opposite.

Now line up the hub so left flange is behind and above the right an sight across. Notice that the holes in one flange are spaced between the holes in the other. The first two spokes you'll be threading will be pulling spokes, so decide it you want both head in or head out. Now, remembering the rim's zigzag sequence you'll thread the spokes in the two flanges in the same sequence, so if the rim is left right, you'll thread a spoke in the right flange, and the first hole to the left in the left flange, and bring them to the corresponding holes in the rim.

Twist the hub to the right and confirm that the spoke to the left in the rim connects the the hole to the left in the hub. Once you've confirmed this, everything else will fall into place.